Yealink SIP-T2 Series Administrator's Manual page 349

Parameters
Description:
Configures the retry times for the IP phone to resend requests when the SIP server Y
is unavailable or there is no response from the SIP server Y for account X.
Web User Interface:
Account->Register->SIP Server Y->Server Retry Counts
Phone User Interface:
None
account.X.fallback.redundancy_type
(X ranges from 1 to 3)
Description:
Configures the registration mode for the IP phone in fallback mode.
0-Concurrent Registration
1-Successive Registration
Web User Interface:
None
Phone User Interface:
None
account.X.fallback.timeout
(X ranges from 1 to 3)
Description:
Configures the time interval (in seconds) for the IP phone to detect whether the
working server is available by sending the registration request after the fallback
server takes over call control.
It is only applicable to the Successive Registration mode.
Web User Interface:
None
Phone User Interface:
None
account.X.sip_server.Y.failback_mode
(X ranges from 1 to 3, Y ranges from 1 to 2)
Description:
Configures the way in which the phone fails back to the primary server for call
Configuring Advanced Features
Permitted Values
0 or 1
Integer from 10 to
2147483647
0, 1, 2 or 3
Default
0
120
0
337